{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The effect of add - on therapy with sitagliptin on glycemic control was prospectively investigated in patients with type 2 diabetes mellitus ( T2DM ) receiving insulin alone or insulin combined with oral antidiabetic drugs ."}
{"Chemical": ["sitagliptin"]}